FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 4
·1291-1299
·
IF 2.2
Li Zhilei,Zhou Jianping,Xu Yan,Shang Yukui,Chen Changhua,Ran Tongtong
Effective farmland management requires real-time monitoring of plant growth status and timely response to stressors. To achieve this goal, we utilized wire organic electrochemical transistors (WECTs) to convert ion signals in plant vasculature into electrical signals in circuits, enabling the detection of ion concentrations. In our study, we employed a flexible substrate composed of a core-sheath structure nanofiber yarn impregnated with poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) as a semiconductor channel. The gate was made of silver wire, while silver paste was sprayed at both ends of the core-sheath yarn to serve as a source and drain. This configuration allowed us to construct a wire organic electrochemical transistor that exhibited modulation performance and sensitivity at low voltages, with a transconductance of 1.07 × 10 –4 S. We conducted sodium ion concentration testing and successfully achieved the sensing of sodium ions at concentrations ranging from 10 –4 to 10 –1 M. This study lays the groundwork for the future development of organic electrochemical transistors in plants, enabling in situ detection of sodium ion concentrations under salt stress.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Cijun Shuai,Jiachi Zhao,Qi Zhong,Shuping Peng,Jun Zan,Zhen Cao
Although photothermal therapy is widely employed for tumor treatment because of its high tumor cell selectivity and low apoptosis resistance, heat-shock proteins (HSPs) impart resistance to heat-induced apoptosis in tumor cells, thus diminishing the therapeutic effectiveness. To this end, tin selenide (SnSe) was grown in situ on reduced graphene oxide (rGO) nanosheets to construct a photothermal–thermoelectric SnSe/rGO nanosystem. The rGO component converted near-infrared light energy into localized thermal energy, resulting in the thermal ablation of tumor cells. Meanwhile, SnSe converted temperature fluctuations into pyroelectric charges, which interacted with surrounding O2 molecules to generate reactive oxygen species that oxidized the amino acids on the HSPs, which changed the protein conformation and functionally damaged the tumor cells. In addition, rGO functioned as an efficient electron acceptor to increase electron mobility, thus enhancing the thermoelectric conversion efficiency of SnSe. Then, the SnSe/rGO nanosystem was incorporated into a poly-l-lactic acid bone scaffold to prevent tumor recurrence. Results showed that the composite scaffold not only exhibited good photothermal and thermoelectric effects. In vitro cell tests demonstrated that the scaffold generated 1O2 based on temperature fluctuations and the antitumor rate reached 86.6% against osteosarcoma MG-63 cells.
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高影响因子
BIOELECTROCHEMISTRY
·
2021
·
IF 5.373
Jintao Liang,Xiaohang Shi,Huafu Feng,Min Chen,Wenzhan Li,Junxiang Lai,Weipeng Hu,Guiyin Li
In this paper, a novel silicon-based light-addressable potentiometric sensor (LAPS) has been designed for the detection of 1,5-anhydroglucitol (1,5-AG) in human serum. Reduced graphene oxide-chitosan-ferrocene (RGO-CS-Fc)/AuNPs nanohybrids and pyranose oxidase (PROD) enzyme is used to fabricate biological sensitive membrane unit by layer-by-layer assembly technology. When a bias voltage is provided to the LAPS system, the catalytic oxidation reaction between 1,5-AG and PROD to produce H 2 O 2 . The by-product H 2 O 2 can oxidize Fc(Fe 2+ ) ions in RGO-CS-Fc nanohybrids into Fc(Fe 3+ ) ions, which cause the potential of the sensitive membrane surface to change and the potential shift of I-V curve will generate a corresponding offset response. Under the optimal conditions, the potential shift of the LAPS is linearly related to the concentration of 1,5-AG at 10 µg·mL −1 –350 µg·mL −1 with the correlation coefficient of 0.97414. The sensitivity is 0.44273 mV/µg·mL −1 and the lowest detection limit is 10 µg·mL −1 . In addition, the biosensor showed good specificity, acceptable stability and satisfactory recovery rates (91.28%-107.66%), which would be a potential testing methods in actual clinical samples.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
X. Li,J. Li,Y. Zhang,P. Zhao
Ni-MOF derived NiO nanosheets growing on rGO have been successfully synthesized by a hydrothermal method following by a series of calcination procedures (300 °C, 400 °C, and 450 °C). The influence of the introduction of rGO and the calcination temperature on electrochemical performance of Ni - MOF derived NiO nanosheets as the electrode material were highlighted in detail. For the three-electrode test system, Ni-MOF derived NiO/rGO composites subjected to calcination at 300 °C demonstrated the highest specific capacitance (435.25 F·g −1 at 1 A·g −1 ), and maintained 68.00% of its initial value at 8 A·g −1 . Its specific capacitance was increased by 49.34% when compared with the initial value after 25,000 cycles at 50 mV·s −1 . With the increase in calcination temperature, the specific capacitance presented the downward tendency (400 °C: 171.50 F·g −1 at 1 A·g −1 , 450 °C: 116.00 F·g −1 at 1 A·g −1 ) due to the reduction in specific surface area originating from the agglomeration of NiO nanosheets. The introduction of rGO greatly enhanced the electrochemical performance of the composites treated at 300 °C (increased by 40.40% at 1 A·g −1 and 47.30% in specific capacitance at 8 A·g −1 ). The assembled hybrid supercapacitors (HSC) with Ni-MOF derived NiO/rGO composites (300 °C) and active carbon as the cathode and anode also displayed the outstanding electrochemical performance. The value of energy density reached to 76.96 Wh·kg −1 at the power density of 400 W·kg −1 . All these results confirm that the MOF-derived NiO/ rGO composite should be a potential electrode material for supercapacitors .
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高影响因子
Sensor Letters
·
2016
·Vol. 14
·期 11
·1067-1073
·
IF 0
Wu Wenwen,Wang Sui
In this work, we reported a luminol electrochemiluminescence (ECL) sensor using a composite material compounded by ZnO nanoparticles and reduced graphene oxide (ZnO/RGO) as electrode membrane and in situ generated hydrogen peroxide as coreactant. The composite material was characterized
by fourier transform infrared spectroscopy analysis (FTIR) and X-Ray powder diffraction (XRD). Then this ZnO/RGO modified electrode was used to determine tetracaine hydrochloride (TA· HCl). Results show that the inhibition of ECL intensity increased with logarithm of TA · HCl
concentration within a linear range from 10–4
μg/mL to 10–2
μg/mL and the detection limit (S/N) was 3.3 × 10–5
μg/mL. In addition, the recoveries of real samples were 85.0%–104.0% (urine),
95.0%–127.4% (serum) and 87.0%–104.6% (raw material drug) respectively, demonstrating an acceptable reproducibility of this method.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Qiao Zhang,Chaoyang Shi,Enze Zhu,Weiping Liu,Kun Liu,Yuhui Li,Wei Li,Xikun Yang,Juan Yu,Mingli Xu
A novel and high-efficiency Pd/TM x O y -rGO/CFP (TM x O y = Co 3 O 4 , Mn 3 O 4 , Ni(OH) 2 ) electrocatalyst for directly integrated membrane electrode was synthesized by controllable cyclic voltammetry electrodeposition combined with hydrothermal process. The results showed excellent performance towards methanol oxidation reduction. The Pd/Co 3 O 4 -rGO/CFP as-prepared catalyst has the best electrocatalytic activity , and mass activity is 5181 mA·mg −1 Pd , which is about 40 times and 4.3 times that of the commercial Pd/C and Pt/C catalyst (JM). It can be attributed that the small size of Pd nanoparticle , uniformity of distribution, and the synergistic interaction between transition metal oxide on the support surface and Pd nanoparticles. The prepared Pd/TM x O y -rGO/CFP composite electrode is a promising catalyst for integrated membrane electrode assembly of proton exchange membrane fuel cells in the future.
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高影响因子
ANALYST
·
2021
·Vol. 147
·期 2
·303-311
·
IF 4.616
Chao Chen,Chenxi Wang,Pengcheng Zhao,Jin Zhang,Dechong Ma,Junjie Fei
First, the nanocomposite Au@rGO-MWCNT was synthesized by a hydrothermal method. Next, a temperature-controlled composite sensing film was prepared by composite modification of poly(2-(2-methoxyethoxy)ethyl methacrylate) (PMEO2MA) and Au@rGO-MWCNT on a glassy carbon electrode (GCE). This sensor was shown to exhibit good temperature sensitivity and reversibility to dopamine. When the testing temperature is lower than the lower critical solution temperature (LCST) of the polymer, the PMEO2MA chain is in a stretched state, which increases the distance between the Au@rGO layers and leads to the inability of MWCNTs in one layer to contact another Au@rGO layer and to low conductivity. Therefore, in this state, dopamine cannot detect an electrochemical signal, and it is termed an “off” state. When the temperature is higher than the LCST of the polymer, the PMEO2MA chain shrinks, allowing the MWCNTs to make contact with another layer of Au@rGO; the electron transfer rate of the modified film increases, and the electrochemical behavior of dopamine turns to an “on” state. Moreover, the sensor has a wide detection range (0.1 to 9.0 μM and 9.0 to 239.0 μM), and the limit of detection of dopamine is as low as 30 nM. This method has been successfully applied to the determination of dopamine in human serum samples. The on–off sensor provides a new avenue for the application of temperature-sensitive polymers.
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PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Hangchun Deng,Jie Huang,Zhiyong Hu,Xiangfei Chen,Dejuan Huang,Tianxiang Jin
A three-dimensionally interconnected molybdenum trioxide (MoO3)/polypyrrole (PPy)/reduced graphene oxide (rGO) composite was synthesized via an eco-friendly three-step method. The as-obtained electrode shows a high specific capacity of 412.3 F g–1 at a current density of 0.5 A g–1 and a good cycling stability (85.1% of the initial specific capacitance after 6000 cycles at 2 A g–1 is retained), and these excellent electrochemical performances can be attributed to the unique structure, remarkable electrical conductivity, and the synergetic effects between MoO3, PPy, and rGO. Furthermore, a symmetric supercapacitor based on a MoO3/PPy/rGO electrode was assembled to investigate the practical application performance of this material. The results demonstrate a high energy density of 19.8 W h kg–1 at a power density of 301 W kg–1. These findings shine a light on the rational design of electrode materials with multicomponents for high-performance supercapacitors.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4138
·
IF 5.719
Weihua Qin,Yueming Ma,Ting He,Jingbin Hu,Pan Gao,Shaoxia Yang
A heterogeneous Fenton-like catalyst with single redox site has a rate-limiting step in oxidant activation, which limited its application in wastewater purification. To overcome this, a bimetallic doping strategy was designed to prepare a heterogeneous Fenton-like catalyst (Fe-Mo/rGO) with a double-reaction center. Combined with electrochemical impedance spectroscopy and density functional theory calculation, it was confirmed that the formation of an electron-rich Mo center and an electron-deficient Fe center through the constructed Fe-O-Mo and Mo-S-C bonding bridges induced a higher electron transfer capability in the Fe-Mo/rGO catalyst. The designed Fe-Mo/rGO catalyst exhibited excellent sulfamethazine (SMT) degradation efficiency in a broad pH range (4.8–8.4). The catalytic performance was hardly affected by inorganic anions (Cl−, SO42−and HCO3−) in the complicated and variable water environment. Compared to Fe/rGO and Mo/rGO catalysts, the SMT degradation efficiency increased by about 14.6 and 1.6 times in heterogeneous Fenton-like reaction over Fe-Mo/rGO catalyst. The electron spin resonance and radical scavenger experiments proved that ·O2−/HO2· and1O2dominate the SMT removal in the Fe-Mo/rGO/H2O2system. Fe and Mo, as active centers co-supported on rGO, significantly enhanced the electron transfer between catalyst, oxidant, and pollutants, which accelerated the reactive oxygen species generation and effectively improved the SMT degradation. Our findings offer a novel perspective to enhance the performance of heterogeneous Fenton-like catalysts by accelerating the electron transfer rate in the degradation of organic pollutants.Keywords:heterogeneous Fenton-like reaction;Fe-Mo dual-reaction-center catalyst;reactive oxygen species;sulfamethazine
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高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 1
·1-11
·
IF 6.048
Wang Xiaoying,Zhang Haiguang,Wang Xu,Chen Shuo,Yu Hongtao,Quan Xie
Reduced graphene oxide (RGO) membranes are theoretically more conducive to the rapid transport of water molecules in their channels compared with graphene oxide (GO) membranes, as they have fewer oxygen-containing functional groups and more non-oxidized regions. However, the weak hydrophilicity of RGO membranes inhibits water entry into their channels, resulting in their low water permeability. In this work, we constructed wettable RGO-MXene channels by intercalating hydrophilic MXene nanosheets into the RGO membrane for improving the water permeance. The RGO-MXene composite membrane exhibits high pure water permeance of 62.1 L/(m 2 ·h·bar), approximately 16.8 times that of the RGO membrane (3.7 L/(m 2 ·h·bar)). Wettability test results and molecular dynamics simulations suggest that the improved water permeance results from the enhanced wettability of RGO-MXene membrane and increased rate of water molecules entering the RGO-MXene channels. Benefiting from good conductivity, the RGO-MXene membrane with electro-assistance exhibits significantly increased rejection rates for negatively charged dyes (from 56.0% at 0 V to 91.4% at 2.0 V for Orange G) without decreasing the permeate flux, which could be attributed to enhanced electrostatic repulsion under electro-assistance.
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 2
·141
·
IF 4.034
Guangzhen Cui,Yanli Lu,Wei Zhou,Xuliang Lv,Jiangnan Hu,Guoyu Zhang,Guangxin Gu
Magnetic nanoparticles, such as Fe3O4and Co3O4, play a vital role in the research on advanced microwave absorbing materials, even if problems such as high density and narrow band impedance matching are still unsolved. Herein, the study of lightweight hollow Fe3O4@reduced graphite oxide (RGO) nanocomposites synthesized via the solvothermal method is presented. The microstructure and crystal morphology of the materials were characterized by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses. Single crystalline hollow Fe3O4spheres were grown onto RGO flakes, leading to the formation of heterojunction, which further influenced the microwave absorption properties. The latter were evaluated by standard microwave characterization in the frequency range of 2–18 GHz. It was found that, for a specific Fe3O4@0.125 g RGO composite, the minimum reflection loss can reach −41.89 dB at 6.7 GHz, while the reflection loss was less than −10 dB from 3.4 GHz to 13.6 GHz for a nanocomposite sample thickness in the range of 1–4 mm. The combination of these two materials thus proved to give remarkable microwave absorption properties, owing to enhanced magnetic losses and favorable impedance matching conditions.Keywords:microwave absorption;solvothermal;heterojunction;hollow Fe3O4
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高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 24
·期 3
·272-281
·
IF 0
Xu Fengyun,Na Ping
Novel three-dimensional string and ball-like titanium dioxide/reduced graphene oxide, TiO 2 /rGO (STG) composites were prepared using a one-step hydrolysis process followed by a low-temperature hydrothermal treatment. The STG composites exhibited excellent photo-catalytic degradation performance for methylene blue owing to a good synergistic effect between TiO 2 and rGO. The STG composites with 1.0 wt% of rGO loading exhibited the highest removal rate of 86.0% for methylene blue and its reaction rate constant (5.27 × 10 −3 min −1 ) was much higher than those of pure string and ball-like TiO 2 (ST). In addition, the STG composites also showed an outstanding capability for the photo-catalysis degradation of other cationic dyes. In addition, a possible photo-catalytic degradation mechanism for the STG composite was postulated, in which \(^{ \bullet } {\text{O}}_{2}^{ - }\) and • OH were the main oxidizing groups. This work offers new insights into a better design and preparation of novel composite materials for the removal of organic dyes.
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